Adjustable drawing-table.



G. A. SGHNORR. ADJUSTABLE DRAWING TABLE. APPLICATION PILED' APR. 26, 1910.

971 81,, Patented Sept 27, 1910.

.INVENTOR, GooRg ADOLF ScHNoRfi W JZVM J ETEE PTT F GEORG ADOLF SCHNORR, OF OBEB-ESSLINGEN, GERMANY, ASSIGNOR TO THE FIRM OF ALBERT MARTZ, OF STUTTGART, GERMANY.

ADJUSTABLE DRAWING-TABLE.

Specification of Letters Patent.

Patented Sept. 27, 1910.

Application filed April 26, 1910. Serial No. 557,801.

To alt whom it may concern:

Be it known that I, Gnonc AnoLr SoHNoRR, a citizen of the German Empire, residing at Ober-Esslingen, in the Kingdom of Viirtemberg, Empire of Germany, have invented certain new and useful Improvements in Adjustable Drawing-Tables; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improved kind of drawing table, the drawing board of which can be brought into any position as regards height, by simply drawing it down or lifting it up and to which also any suitable inclination may be given, in a very simple manner.

The improved drawing board is more particularly characterized by its being able to be placed higher and lower parallel with itself, that is to say, that it also retains its adjusted inclination. For this object it is loosely revolubly arranged on a horizontal axis, and may be swung with this on another fixed horizontal shaft into any suitable elevation. In order not to alter the inclination to which the board has been adjusted, a chain wheel or other suitable transmission member of equal size is fixed both on the fixed shaft as well as on the drawing board, both these members being connected by means of an endless chain or the like. Now if the drawing board shifted, that is to say placed higher or lower, the chain rolls off one chain wheel and winds to an equal extent on the other, without the chain wheel and the drawing board thereby turning. In order to alter the inclination of the drawing board, it is merely necessary to release certain means of attachment, whereupon the drawing board may be placed more or less obliquely, without further difliculty. The drawing board is also counterbalanced in the ordinary way, and may then be fixed in the adjusted position.

The invention will now be more particularly described in connection with the ac companying drawings in which one form of construction is shown as an example.

Figures 1 and 2 are a side view and rear view respectively of the drawing board; while Fig. 3 is an axial section on an enlarged scale of the device for mounting and setting the drawing board.

The drawing board a itself is loosely revolubly mounted on a horizontal shaft 7), which is carried by arms 0. The arms 0 turn on a horizontal shaft (Z which is revolubly mounted in the frame 6, so that the drawing board a, may be swung into any elevation about the axis cl, while it is counterbalanced by weights f, so that it remains stationary. Links p are also provided on the arms 0 for fixing it at any desired elevation, the ends of which links move along a slotted guide a, and may be fixed by means of screws 0. Now in order during this adjustment of the drawing board a to prevent an alteration of its inclination, chain wheels 9 or the like are preferably mounted on the shaft 5 at each side and firmly connected with the drawing board a, and also similar chain wheels h on the shaft cl, which are connected by chains z' with the chain wheels g. Now if the drawing board is adjusted in height, for instance brought from the position shown in full lines in Fig. 1, into the lower position shown in dotted lines, the chains 13 unwind from the chain wheels 9 and are also wound up to the same extent on the chain wheels h, that is to say no rotation of the chain wheels 9 takes place, and the inclination of the drawing board a re mains the same.

In order to fix the drawing board at the desired inclination, the chain wheel in or the shaft (Z is provided with a crank handle it", which when the drawing board is placed obliquely is displaced along a slotted segment Z and may then be fixed in the desired position by means of a grip screw m, so that the drawing board a retains the inclined position to which it has been adjusted. The drawing board may also be turned by means of the crank handle 70 itself.

Instead of using chain wheels, other transmission members might equally well be provided, which also need not necessarily be endless.

I declare that what I claim is:

1. A drawing table composed of a frame and a drawing board adjustable vertically without changmg its inclination, having in combination a shaft on which the board is rotatably mounted, a horizontal frame shaft, arms connecting the board shaft with the oscillates about the frame shaft, wheels of the same radius on the board axis and the frame shaft, and driving means connecting the frame shaft with the drawing board axis, adapted to raise or lower the board without changing its angle of inclination.

In testimony whereof I affix my signature, in presence of two witnesses.

GEORG ADOLF SCHNORR.

Vitnesses HERMANN WVIETHUOHER, FRANZ GAUPP. 

